Add drm and kernel permissions to mediaprovider

These were missing when the sepolicy was migrated.

Addresses denials:

E SELinux : avc:  denied  { find } for service=drm.drmManager pid=11769
uid=10018 scontext=u:r:mediaprovider:s0:c512,c768
tcontext=u:object_r:drmserver_service:s0 tclass=service_manager

W kworker/u16:2: type=1400 audit(0.0:1667): avc: denied { use } for
path="/storage/emulated/0/DCIM/Camera/IMG_20170425_124723.jpg"
dev="sdcardfs" ino=1032250 scontext=u:r:kernel:s0
tcontext=u:r:mediaprovider:s0:c512,c768 tclass=fd permissive=0

Bug: 37685394
Bug: 37686255
Test: Sync files
Test: Open downloaded file

Change-Id: Ibb02d233720b8510c3eec0463b8909fcc5bbb73d